I dont know too much about the mail stuff you are trying to install or if it requires a mysql DB however those options look like they are ./configure options for building PHP from source
f you would like to see what your PHP can support try this:
1. install and run apache (if u dont have it just grab the rpm and rpm-ivh it)
2. go to the directory that contains the web document root (/var/www/html i think)
3. open up your favorite text editor and create a new file with this in it:
<?php
phpinfo();
?>
4. save file as test.php
5. move file or save file to directory from step 2 above (you may need to be root)
6. start apache (via command line or use the service GUI to start httpd)
7. open web browser and go to
http://localhost/test.php
this will give you all of the options that php was build with and all of the functions, etc. that it is setup to support
good luck!